Reversible check-valve and cut-off.



H. G. DUNLAP.

REVERSIBLE CHECK VALVE AND GUT-OFF.

APPLICATION FILED APR. 27, 1911. 1,005,523, Patented Oct. 10, 1911.

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REVERSIBLE CHECK VALVE AND OUT-OPP.

1,005,523. Patented Oct. 10, 1911.

Z sHEETS-SHEET 2- JD E flr ry 6192/754 1 altar nag HARRY G. DUNLAP, OFCHICORA, PENNSYLVANIA.

REVERSIBLE CHECK-VALVE AND CUT-OFF.

Specification of Letters Patent.

Application filed April 27, 1911.

Patented Oct. 16, 1911. Serial No. 623,592.

To all whom it may concern:

Be it known that I, HARRY G. DUNLAP, a citizen of the United States,residing at Ohicora, in the county of Butler and State of Pennsylvania,have invented certain new and useful Improvements in ReversibleCheck-Valves and Cut-Offs, of which the following is a specification.

In the control of the flow of liquids, such as the piping of oil and inwater distribution, it is very desirable in many cases to control themovement in either direction by a check valve, or to cut off the flowentirely.

The object of my invention is to provide for all of these conditions bya single valve of simple and practical construct-ion which is a checkvalve capable of controlling flow in either direction and also a out OKvalve.

It relates to that form of valve in which a turning plug is made of asize large enough to contain a check valve and is ca pable of rotation,so as to permit the flow of liquid through it in either direction, andmy invention consists in the special construction and arrangement of anovel form of valve of this class which is made of a large size to adaptit to the piping of oil and which embodies a check valve within a largeturning plug together with special provisions for preventing the checkvalve from becoming disabled and special provision for prevent ing thelarge turning plug from becoming immovable by access of grit and dirt toits ground joint, as will be hereinafter more fully described withreference to the drawing, in which Figure 1 is a vertical longitudinalsection, showing the adjustment of parts for passing the liquid throughfrom left to right. Fig. 2 is a similar view, showing the position ofthe parts for passing the liquid from right to left. Fig. 3 is ahorizontal section, showing the position of parts for cutting off theflow entirely. Fig. 4 shows a ball valve which may be employed as amodification. Fig. 5 shows a modification in which the turning plugcontains a hinge valve.

In the drawing, A represents the outer casing which is formed with twoopposite screw threaded openings for connection with the incoming andoutgoing pipes. This casing is bored with a tapered hole to receive atapered turning plug B, which parts are fitted with a ground joint. Thetapered plug is made longer than the usual plug and the openings C C inthe casing which communicate with the pipes are made narrow, but muchdeeper in vertical direction than usual, so as to communicate eitherwith a port above the middle line of the plug or a port below saidmiddle line. The plug B is made hollow and has at the middle line acircular shoulder D extending straight across and having a circularopening through it to form a valve seat for a check valve E with acylindrical chamber below it. This valve has depending from its lowerside a plurality of lugs a thatfit closely the cylindrical chamber belowthe valve seat, which lugs guide the valve as it moves up and down, andhas also projecting from the top a stem Z) which enters a tubular guide71. in the cap. In one side of the plug above the check valve is formeda port 0 and in the other side of the plug below the check valve isformed a port 0 Both of these ports, however, are within the range ofcommunication with the vertically elongated openings C C of the casingwhich communicate with the pipes.

The lower end of the plug extends through the bottom of the casing andhas a central hole (Z through the same extending from the bottom of thevalve chamber down through the end of the plug where it is closed by adetachable screw sto-pple e. The lower end of the plug is secured in theusual way by a washer f and screw nut 9.

At the upper end of the plug it is squared to receive a wrench forturning it and is also provided with a screw cap F which closes the topof the hollow plug. This screw cap and opening in the top of the plugare made large enough to permit the insertion or removal of the checkvalve through the same, and said screw cap is also formed with adownwardly extending tubular projection it that receives. and guides thetop of the valve stem.

Now, with the parts in the position shown in Fig. 1, the liquid passingfrom left to right enters the lower port of the plug, lifts and passesthrough the check valve and issues through the upper port of the plug tothe pipe on the right hand side, the check "alve preventing any backmovement. If, however, the plug be turned a half revolution, as in Fig.2, then the lower port of the plug receives the liquid from the righthand side and passes it through the check valve to the pipe on the lefthand side. It will thus be seen that the check valve is equallyoperative for checking the flow in either direction by merely reversingthe plug. If it is desired to cut off the flow entirely, then the plugis turned only a quarter of a revolution, as in Fig. 3, and when left inthis position the imperforate sides of the plug are long enough toentirely cover the elongated openings on the opposite sides of the casinMy valve is especially designed for the piping of oil as from tank totank in the oil fields, and is therefore made of large size to connectwith large pipes of three inches diameter; more or less. When a turningplug is made of such large size to adapt it to this use it is importantthat the ground joints should be kept clear of all grit and dirt toprevent the turning plug from becoming jammed and immovable and it isalso important that the check valve seat should be kept clear of suchsedimentary obstruction. To accomplish these results withoutdismembering the parts or opening the valve the draining and clean outpassageway (Z is formed longitudinally through the small end of theturning plug and the screw stopple e is provided for the same. Thispassageway opens downwardly from the trap chamber below the check valveand the stopple 6 may be conveniently removed, without disconnecting thevalve from the pipes, so as to discharge the grit and dirt from the trapchamber. This clean out passageway (Z extends straight through the lowerend of the turning plug and has an important and correlated action witha chambered plug and a check valve working in the same, for it permits,at any time, of the, discharge of grit and sediment without stopping theflow of oil through the pipes or disconnecting the valve and thusmaintains the operative condition of the check valve by preventing gritand sediment from getting on its seat and also discharges such grit andsediment without allowing any of it to get into the ground joint of theturning plug and causing it to become immovable.

In carrying out my invention I do not confine myself to any particularform of check valve. Thus, for instance, instead of the valve shown inFigs. 1 and 2, I may use a ball valve with a ring seat, as shown in Fig.4, or, as in Fig. 5, the plug may be made more slender and in twoseparable longitudinal parts, and a hinge valve '0 may be arrangedwithin a chamber of the same to close over the port. This plug, however,is provided with the same drainage hole through the lower end of thesame.

I claim:

1. The combination of a casing, a tapered reversible turning plugextending through both top and bottom of the casing and containing achamber with a valve seat and a check valve on said seat, said plughaving a clean out passageway from the bottom of the chamber of the plugthrough the smaller end of the plug and a closure for the same.

2. A reverse flow check valve comprising a casing, a hollow taperingturning plug extending through both top and bottom of the casing andcontaining a valve seat in its chamber with an opening in the plug abovethe valve seat on one side and an opening below the valve seat on theother side, a check valve on said seat, said plug having a clean outhole extending from the lower part of its chamber below the check valvestraight down. through the smaller end of the plug, aclosure for saidhole and a nut and washer on the lower end of the plug above saidclosure.

In testimony whereof I aflix my signature in presence of two witnesses.

HARRY G. DUNLAP. \Vitnesses DAVID M. DUNLAP, C. M. FORREST.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

